Which of the following is a reason a theory can not be a law

Models are non-visual ways of coummincating how someone thinks about something in the natural world

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

In which layer do organisms on earth love?